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Nuclear weapons and the United Kingdom
The United Kingdom was the third country to test an independently developed
nuclear weapon
, in October 1952. It is one of the five nuclear-weapon states under the NPT and a
permanent member
of the
UN Security Council
. Since the
1958 US-UK Mutual Defence Agreement
, the United States and the United Kingdom have cooperated extensively on nuclear security matters. The
special relationship between the two countries
has involved the exchange of
classified
scientific data and materials such as
plutonium
.
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